Geology, or the study of rocks, can be a fascinating way to learn about the Earth's history.Relative dating is a key component to unlocking the mysteries of the Earth's past.Though radiometric dating offers a modern way to date rocks, the principles of stratigraphy remain a tried and true way to learn about rock layers.Stratigraphy, or the scientific study of rock layers, includes relative dating.[Note: For embedded comments, checks for understanding (CFUs), and key additional information on transitions and key parts of the lesson not necessarily included in the below narrative, please go to the comments in the following document: Dating & Rock Layering (Whole Lesson w/comments).
To understand stratigraphy and relative dating, four basic principles must be mastered.For example, the presence of recycled bricks at an archaeological site indicates the...Relative dating methods allow one to determine if an object is earlier than, later than, or contemporary with some other object." After 30 - 60 seconds, we come back together and discuss, where I solicit a few responses.
Most of them are able to do this pretty easily, after which I ask "why? But in the discussion, I also mention that even though we know who is oldest, youngest, and their relative order, we don't know After the introduction, we take some time to whole group read over the brief text on relative/absolute dating.
..radiometric methods of dating rocks, the ages of rocks and other geologic features could not be expressed quantitatively, or as numbers of years, but instead were expressed solely in terms of relative ages, in which the age of a particular geologic feature could be expressed as relatively younger or older than other geologic features. Local relationships on a single outcrop or archaeological site can often be interpreted to deduce the sequence in which the materials were assembled.